Wireless synchronizer



E. BANCROFT. WIRELESS SYNCHRONIZEH. lAwww/111011 HLED 1350.19. 1919.

Patented Dec. 21,1920.

La eer/'a7 UNITED STATES PATENT OFFICE..

ERNEST BANCROFT, OF SOZNOINIA, GLIFORNIA.

WIRELESS SYNGHRON 1ZER.

'of California, have invented new and useful Improvements in WirelessSynchronizers, of which the following is a specification.

This invention relates to wireless timers,

` and the object .of the present 4invention is to provide an apparatusfor timing the oscillations sent to the detector to correspond lto theoscillations coming to the aerial, which will be rapid and certain inits action.

A further object isto provide an apparatus for rapidly and convenientlysimultaneously varying the distances of all the inductance coils of thetickler from the primary inductance coils and also simultaneously of allthe inductance coils of the secondary circuit from the primaryin-ductance coils, so that such coils may be capable of being used forvarious wavelengths.

In the accompanying drawing, Figure l is a diagrammatic view of myinvention; Fig. 2 is a sectional view .on the line 2--2 of te-terring tothe drawing, l indicates a variable condenser having a pole 2 adaptedtovbe connected to an aerial. The. other pole '3 of the condenser islconnected by a wire 4 to the pole 6,01 the-primary variable condenser 7.:The 4condenser 1 is employed only when it is. necessary to-l reduoethe' lengths oit'- the oscillations arriving at the aerial and a switch8 is employed to cut out the condenser 1 when not needed..

. Fromthe pole 6; of the, condenser 7 leads a wire pa to a leverpla,which, asshown, vcontacts with the end of a. wire-psa, leading to aninductanoe coil p3, trom which inductance coil a wire p35 leads, the'end of said ,wire beine;I shown as electrically connected to a leverplbwhich isconnected-to: a wire pb connected with 'the other ole. 10 ofsaid primary variable condenser a wire 9 leading-therefrom to theground. y

Closely adjacent to the inductance coil p and on opposite sides thereofare inductance coils t and s, secured to rods 11 12 of lating materialrotatable about t cir axes in bearings 13. l

Wires sa and s'b lead into proximity to levers sla, sZb and, as hereshown, are in contact therewit from which levers wires sa, ab, leadto'poles 14, 15.0 f a secondary variable Specification of LettersPatent.

Patented Dec. 21. 1920.

Appneanm mea nember 19, ma serial m. 345,9sa`

' condenser 17 from which poles wires 18, 19

lead to the detector of the apparatus.

From the inductance coil t3 wires ria, tab ,lead Into proximity to, and,as here shown, are in Contact with, levers lila, tlb, from which leverswires ta, tb, lead to the tickler coil connections of the detector.

By Varying the proximity of the Acoils t3,

s to the coil p3, the signal lengthsproceedingtherefrom can be .variedas desired. This variation may be accomplished by turning the rods abouttheir axes which can be donc by turning two buttons ,or handles 2lmounted 011 shafts 22i which carry beveled pinions 23 which mesh withbevel pinions 24 on the ends of the rods l1 and 12. For thesake ofclearness of illustration the shafts 22 are shown -in the diagrammaticfigure in the sameplane, although in actual practice, they will extendin parallel planes and the buttons or handles 21 will Lbe in front oithe beveled pinions.

T his set of inductance coils heretofore dcscribed is only one of aseries of sets of intla, tfb, pa, p51), 35a., S56, which extend intosla, all.

These levers have slotted arms 26 which, receive pins 27 extending froman insulated rod 28 having a pin 29- received by a slotted arm 31Amovable with a wave length changeproximity to the vlevers tlc, Z-b. plc,p26.

over switch 32 having an indicator 33 movable over a graduated are 34:.By turning` said switch 32, any one of the sets of inductance coilsI'suitable for receiving" oscillations.. of any desired length can bebrought V into operation, and by turning the buttons orhandles 21,inductance coils of the tickler l or secondary circuit can be movednearer to, or farther from, the primary inductance coils as desired toobtain the best results with the selected coils for the necessary wavelenlgth.

claim: 1. The combination with a primary var-1able condenser, ofwhichonepole isadapted to be connected with 'an aerial and the other `polewith the ground, a secondary variable condenser of which the poles areelectrically connected with the detector, and a tickler, two pairs .ofmovable lconducting elements electrically connected respectively, onepair with the primary condenser and the other pair with the secondarycondenser, a series of sets of inductance coils, wires from theinductance coils of ea'ch setleading into proximity to said elements tobe electrically connected therewith by the movement of said elements,each pset comprising a primary inductance coil, the wires therefromleading' into proximity with the pair of elements electrically connectedto the primary condenser, and a secondaryinductance coil, the wirestherefrom leading into proximity'to the pairs-of elements electricallyconnected to the secondary condenser, and means for moving all ofv sa-idelements in unison to make electrical connections with the inductancecoils of lany one 'of said sets. l j 2. The combination with a primary variable condenser, of which one pole is adapt-I- ed to be-connected'with an aerial and the other pole vwith theground, a secondary variablecondenser of which the poles kare electrically connected with thedetector, and a tickler, a series of pairs of movable conductingelements electrically connected respec-` tively, one pair with theprimary condenser, another pair with the secondary condenser, and theremaining pair with the tickler coil connections of the detector, aseries of sets of inductance coils, wire from the inductance coils ofeach set leading into'proximity to lsa-id elements to be electricallyconnected therewith by the movement 'of said elements, each setcomprising a primary inductance coil, the wires therefrom leading intoproximity with the pair-of elements electrically connected to theprimary condenser, a secondary inductance coil, the wires therefromleading into proximity to the pairs of elements electrically connectedto the secondary condenser, and a tickler inductance coil,

the wires therefrom leading into proximity with the pairs of elementselectrically connected to the tickler coil connections of the detector,and means for'moving all -of saidelements in unison to make electricalconnections wlth the-inductance coils of any one of said sets.

' 3. The combination with a primary variable condenser, of which onepole is adapted to be connected with an aerial and the other p ole lwiththe ground, a secondary variable condenser of which the poles areelectrically connected with the detector, two

l.pairs of movable conducting elements electrically connectedrespectively, one pair withthe primary condenser, and the other pairwith the secondary condenser, a series of sets of inductance coils,wlres from the induc- `tance coils of each set leading' into proximityto said elements to be electrically connected therewith by the movementof said elements, each set comprising a primary inductance coil,the-wires therefrom leading into proximity with the pair of elementselectrically connected to the primary condenser, and a secondaryinductance coil, the wires therefrom'leading into proximity to the pairs'of elements electrically connected to the secondary condenser,and-means for Simultaneously moving ther vsecondaryA inductance coil ofall'the sets.

4. The combination with a primary vayriable condenser, of which one poleis adapted to be connected with an aerial and the inductance coils,wires fromthe inductance l.

coils of each set leading into proximity to said elements to beelectrically connected .therewith by the movementof said elements,

`each set comprising a primary inductance coil, the wires therefromleading into proximity with thepair Aof elements electrically connectedto the primarv condenser, a secondary inductance coil, thewirestherefrom i leading into proximity tothe pairs of elements 'electricallyconnected to the secondary condenser, and a tickler inductance coil, thewires therefrom leading into proximity 'with the pairs of elementselectrically conjnectedto the tickler coil connections ofthe detector,and means for simultaneously movina` the secondary inductance coils ofall the sets and rfor simultaneonslv moving the .tlckler inductancecoils of all the sets.l

